12731101 has 4 divisors (see below), whose sum is σ = 12739804. Its totient is φ = 12722400.

The previous prime is 12731099. The next prime is 12731129. The reversal of 12731101 is 10113721.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3422500 + 9308601 = 1850^2 + 3051^2 .

It is a cyclic number.

It is not a de Polignac number, because 12731101 - 2¹ = 12731099 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12731161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1560 + ... + 5281.

It is an arithmetic number, because the mean of its divisors is an integer number (3184951).

Almost surely, 2^12731101 is an apocalyptic number.

It is an amenable number.

12731101 is a deficient number, since it is larger than the sum of its proper divisors (8703).

12731101 is an equidigital number, since it uses as much as digits as its factorization.

12731101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8702.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 12731101 is about 3568.0668435443. The cubic root of 12731101 is about 233.5009514426.

Adding to 12731101 its reverse (10113721), we get a palindrome (22844822).

The spelling of 12731101 in words is "twelve million, seven hundred thirty-one thousand, one hundred one".